linux-kernel - [PATCH] LoongArch: Add PREEMPT

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Message-ID: <20241121034127.8325-2-xry111@xry111.site>
Date: Thu, 21 Nov 2024 11:41:28 +0800
From: Xi Ruoyao <xry111@...111.site>
To: Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	Peter Zijlstra <peterz@...radead.org>
Cc: Tiezhu Yang <yangtiezhu@...ngson.cn>,
	Jinyang He <hejinyang@...ngson.cn>,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Xi Ruoyao <xry111@...111.site>
Subject: [PATCH] LoongArch: Add PREEMPT_LAZY support

Like x86 and RISC-V, we are using GENERIC_ENTRY so supporting
PREEMPT_LAZY just needs to allocate a bit in thread flags.

Signed-off-by: Xi Ruoyao <xry111@...111.site>
---
 arch/loongarch/Kconfig                   | 1 +
 arch/loongarch/include/asm/thread_info.h | 8 +++++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index d9fce0fd475a..b8cc5997d595 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -25,6 +25,7 @@ config LOONGARCH
 	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
 	select ARCH_HAS_PTE_DEVMAP
 	select ARCH_HAS_PTE_SPECIAL
+	select ARCH_HAS_PREEMPT_LAZY
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SET_DIRECT_MAP
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
diff --git a/arch/loongarch/include/asm/thread_info.h b/arch/loongarch/include/asm/thread_info.h
index 8bf0e6f51546..fd68a6d81b8e 100644
--- a/arch/loongarch/include/asm/thread_info.h
+++ b/arch/loongarch/include/asm/thread_info.h
@@ -66,8 +66,9 @@ register unsigned long current_stack_pointer __asm__("$sp");
  * - pending work-to-be-done flags are in LSW
  * - other flags in MSW
  */
-#define TIF_SIGPENDING		1	/* signal pending */
-#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
+#define TIF_NEED_RESCHED	0	/* rescheduling necessary */
+#define TIF_NEED_RESCHED_LAZY	1	/* Lazy rescheduling needed */
+#define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NOTIFY_RESUME	3	/* callback before returning to user */
 #define TIF_NOTIFY_SIGNAL	4	/* signal notifications exist */
 #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
@@ -88,8 +89,9 @@ register unsigned long current_stack_pointer __asm__("$sp");
 #define TIF_LBT_CTX_LIVE	20	/* LBT context must be preserved */
 #define TIF_PATCH_PENDING	21	/* pending live patching update */
 
-#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
+#define _TIF_NEED_RESCHED_LAZY	(1<<TIF_NEED_RESCHED_LAZY)
+#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
 #define _TIF_NOHZ		(1<<TIF_NOHZ)

base-commit: 43fb83c17ba2d63dfb798f0be7453ed55ca3f9c2
-- 
2.47.0